Question

For a longitudinal wave,

• A. the disturbance direction is perpendicular to the propagation direction.
• B. the disturbance direction is parallel to the propagation direction.
• C. the disturbance direction is independent of the propagation direction.
• D. None of these

Answer 1

The correct option is B the disturbance direction is parallel to the propagation direction.

In longitudinal waves, the disturbance of the medium particles is parallel to the direction of propagation of wave.
For example, sound waves are longitudinal waves.
Whereas, in transverse waves, the disturbance of the particles is perpendicular to the direction of propagation of wave.
For example, waves produced on string are transverse waves.